Relationship dossier
Iran
United Kingdom
Relationship assessment
Recurring confrontation over detainees, maritime incidents and Iran’s nuclear programme, alongside periods of diplomatic engagement.
Iran toward United Kingdom
-65Iranian authorities detained British-Iranian dual nationals, and in 2019 Iran seized the British-flagged tanker Stena Impero. The 2011 attack on the British Embassy in Tehran further damaged relations.
United Kingdom toward Iran
-40The United Kingdom has imposed sanctions on Iranian individuals and entities and has raised concerns over Iran’s detention of British-Iranian dual nationals and maritime actions. It also participated in diplomatic negotiations over Iran’s nuclear programme.
Overall relationship
-50The relationship combines sustained security and consular disputes with periodic diplomatic engagement, including UK participation in nuclear negotiations and the reopening of the British Embassy in Tehran in 2015. The recurring confrontations have been a major feature of ties.
How to read these scores
Scores are rough judgments, not objective measurements or current verification. Directional scores describe government policy and conduct, not public opinion. The overall score is an independent estimate, never an average.
- −100
- Extreme sustained hostility
- −50
- Substantially adversarial
- 0
- Mixed or neutral, supported by knowledge
- +50
- Substantially cooperative
- +100
- Exceptionally close sustained partnership
“Not assessed” means there is no recorded score. Pair existence makes no claim about diplomatic recognition or established relations.
Relationship context
Overview
Iran–UK relations have been marked by recurring confrontation, including the 2011 attack on the British Embassy in Tehran, Iran’s detention of British-Iranian dual nationals, and the 2019 seizure of a British-flagged tanker. The United Kingdom has imposed sanctions and raised concerns over these actions, while also participating in diplomatic efforts over Iran’s nuclear programme. The British Embassy in Tehran reopened in 2015, but this did not end major disputes.
Areas of tension
- Detention of British-Iranian dual nationals
- Iran’s 2019 seizure of the British-flagged tanker Stena Impero
- The 2011 attack on the British Embassy in Tehran
- Disputes over Iran’s nuclear programme and related sanctions
Key developments
Protesters attacked the British Embassy in Tehran, prompting the United Kingdom to close its embassy and withdraw diplomatic staff.
The United Kingdom reopened its embassy in Tehran, restoring a direct diplomatic presence.
Iran seized the British-flagged tanker Stena Impero in the Strait of Hormuz.
Major uncertainties
- The full scope and implementation of bilateral diplomatic and consular arrangements are unclear.
- The extent to which nuclear diplomacy has produced durable bilateral cooperation is uncertain.